A rear axle center coordinate positioning device and positioning method for a vehicle

Abstract

The application discloses a kind of vehicle rear axle center coordinate positioning device and positioning method, wherein positioning device includes: positioning hole, the positioning hole is arranged in the center of vehicle rear axle tire;Supporting rod, one end of the supporting rod is fixedly connected on the positioning hole;Bearing, the bearing includes inner ring and outer ring, the inner ring is fixed with shaft, and the other end of the shaft is fixedly connected with the supporting rod.Laser pen, one end of the laser pen is fixed with the outer ring of the bearing;Magnet, the magnet has two, two The magnet is attracted to each other, and is fixed on the two sides of the laser pen by magnetic force, one side of the laser pen is provided with a touch switch, and the touch switch is pressed by one of the magnets.The application can accurately and quickly measure relevant parameters, so as to improve test efficiency and test accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of parking vehicle coordinate positioning, in particular to a vehicle rear axle center coordinate positioning device and positioning method. BACKGROUND

[0002] APA automatic parking system is generally divided into pure ultrasonic APA system and fusion APA system.

[0003] Pure ultrasonic APA system refers to that the sensor is only ultrasonic sensor, and the system searches for parking space by using the ultrasonic sensor, and prompts whether to park by the driver after searching for a suitable parking space. The condition for pure ultrasonic APA to search for parking space is that one side or both sides of the parking space need to have an obstacle as a reference. Pure ultrasonic APA system is to use the obstacle to determine whether there is a suitable parking space for parking. The parking space is also called space parking, see Figures 1-4 .

[0004] Fusion APA system refers to that the sensor is not only ultrasonic sensor, but also camera sensor. In addition to the function of pure ultrasonic APA system, it can also realize the parking space with lines on the ground (commonly known as line parking space). That is, the camera sensor is equivalent to eyes, which can see the line parking space on the ground and remind the driver whether to realize parking, see Figure 5 and Figure 6 .

[0005] For the development of fusion APA system, we need to know the relationship between the found line parking space and the vehicle position, so as to better park in the center position of the line parking space. Generally speaking, the so-called parking space position is mainly based on the rear axle center of the vehicle. Therefore, it is necessary to accurately know the actual rear axle center position (x, y) of the vehicle during the development of APA. The software of the vehicle in running will also calculate the theoretical coordinate value (x', y'), which are theoretically the same. The problem is that there will be errors in actual operation. We need to know how much the error is, whether it is reasonable, and how to compensate. The software theoretical value of the vehicle in running can be output to the computer for viewing, but the rear axle center position of the vehicle needs to be measured actually. The previous measurement method is generally as shown in Figure 7 .

[0006] That is, the lowest point of the two tires is visually observed and marked on the ground. After the vehicle is moved away, the midpoint of the two marks is measured, which is the rear axle center position of the vehicle.

[0007] This measurement method is low in efficiency and large in measurement error. The reason is that it is difficult to visually locate the lowest point of the tire and the tangent point of the tire.

[0008] In the calibration of parking system of image line parking space recognition, the coordinate relationship of line parking space relative to the rear axle center of the vehicle is generally recognized, so as to know the difference between the value calculated by the system software and the actual value. Previously, the positions of the two rear tires were measured manually, which was low in efficiency, and it was difficult for the manual operation to measure the tangent point of the tire on the ground, so that the accuracy of the measurement was generally poor. SUMMARY

[0009] Therefore, in order to solve the above technical problems, the purpose of the present application is to provide a vehicle rear axle center coordinate positioning device and a positioning method. The positioning device and the positioning method can accurately and quickly measure the relevant parameters, thereby improving the test efficiency and the test accuracy.

[0010] The technical scheme adopted is as follows:

[0011] The vehicle rear axle center coordinate positioning device of the present application comprises:

[0012] A positioning hole is arranged at the center of the tire of the rear axle of the vehicle.

[0013] A support rod is fixedly connected at one end to the positioning hole.

[0014] A bearing comprises an inner ring and an outer ring, the inner ring is fixed with a shaft rod, and the other end of the shaft rod is fixedly connected with the support rod.

[0015] A laser pen is fixed at one end with the outer ring of the bearing.

[0016] Two magnets are provided, the two magnets are attracted to each other, and are fixed on both sides of the laser pen by magnetic force. One side of the laser pen is provided with a touch switch, and the touch switch is pressed by one of the magnets.

[0017] Further, the positioning hole is threadedly connected with the support rod.

[0018] Further, the positioning hole is fixed with a nut, and the nut is threadedly connected with the support rod.

[0019] Further, the shaft rod is threadedly connected with the support rod.

[0020] Further, the shaft rod has external threads, the support rod has internal threads, and the shaft rod is screwed into the internal threads of the support rod.

[0021] Further, the laser pen is a cuboid.

[0022] Further, the bearing is adhesively fixed on the laser pen.

[0023] Further, the other magnet which does not press the touch switch is adhesively fixed on the laser pen.

[0024] The vehicle rear axle center coordinate positioning method comprises the following steps:

[0025] S1. The vehicle rear axle center coordinate positioning device is arranged on two opposite tires of a vehicle rear axle;

[0026] S2. The laser pen is opened by a magnet, and a laser point is generated on the ground; the laser point generated on one tire is marked as point A, and the laser point generated on the other tire is marked as point B;

[0027] S3. The vehicle is moved away, and the distance between the two marked points is measured by a ruler; the position of the distance halved is the vehicle rear axle center position.

[0028] Further, in step S2, a color pen is used for marking or a label paper is used for marking.

[0029] The vehicle rear axle center coordinate positioning device and the vehicle rear axle center coordinate positioning method have the following beneficial effects:

[0030] In the positioning device and the positioning method, a laser pen is externally arranged on the center of each of the two rear wheels of the vehicle, the laser pen is provided with a bearing and will not rotate with the rotation of the tire, so that the light emitted by the laser pen is almost vertically irradiated on the ground, the position of the light point on the ground is marked by a marking pen when the vehicle is stopped, and the distance between the two points is measured by a ruler after the vehicle is moved away; therefore, the midpoint position of the distance is the vehicle rear axle center, so that the positioning device and the positioning method can accurately and quickly measure the relevant parameters, thereby improving the test efficiency and the test accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 It is a double-side vertical space parking lot diagram.

[0033] Figure 2 It is a single-side vertical space parking lot diagram.

[0034] Figure 3 It is a double-side horizontal space parking lot diagram.

[0035] Figure 4 It is a single-side horizontal space parking lot diagram.

[0036] Figure 5 It is a vertical line parking lot diagram.

[0037] Figure 6 The figure is a schematic diagram of a horizontal parking space.

[0038] Figure 7 The figure is a schematic diagram of a visual measurement method.

[0039] Figure 8 The figure is a schematic diagram of the structure of a vehicle rear axle center coordinate positioning device.

[0040] Figure 9 The figure is a schematic diagram of the structure of a vehicle rear axle center coordinate positioning device in working state.

[0041] Figure 10 The figure is an exploded schematic diagram of a vehicle rear axle center coordinate positioning device. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only preferred embodiments of the present application, but not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] Referring to Figure 8 , Figure 9 and Figure 10 , a vehicle rear axle center coordinate positioning device includes a positioning hole, a support rod 2, a bearing 3, a laser pen 4 and a magnet 5.

[0044] The positioning hole is arranged at the center of a vehicle rear axle tire 100. The positioning hole can be provided with a threaded hole itself. As a specific embodiment, the positioning hole is fixed with a nut 1.

[0045] The support rod 2 is fixedly connected at one end to the positioning hole. The fixed connection can be in various forms, such as buckle connection, threaded connection or other detachable connection. As a specific embodiment, the positioning hole is threadedly connected with the support rod. Further more specifically, the positioning hole is threadedly connected with the support rod 2 through the nut 1. This can not only be detachable but also can be quickly threadedly connected.

[0046] The bearing 3 includes an inner ring and an outer ring, and the inner ring is fixed with a shaft 31, which is fixedly connected at the other end to the support rod 2. The fixed connection can be in various forms, such as buckle connection, threaded connection or other detachable connection. As a specific embodiment, the shaft is threadedly connected with the support rod. Further more specifically, the shaft has external threads, the support rod 2 has internal threads, and the shaft 31 is screwed into the internal threads of the support rod 2 for connection. This can be directly screwed in or out. When working, it is screwed in, and when disassembling, it is screwed out.

[0047] Laser pen 4, one end of the laser pen 4 is fixed with the outer ring of bearing 3; the fixed mode can be various. It can be indirectly fixed through an intermediate piece, or it can be directly fixed. Direct fixing can be fixed by bonding, that is, the bearing 3 is bonded on the laser pen 4. The laser pen adopts a common laser pen with a light touch switch. This is easy to buy in the prior art. Therefore, no more description is made on the internal structure of the laser pen. The shape of the laser pen can be selected as a cuboid. In this way, the magnet can be clamped.

[0048] Magnet 5, the magnet has two, the two magnets attract each other, and are fixed on the two sides of the laser pen by magnetic force. One side of the laser pen is provided with a light touch switch 6, and the light touch switch 6 is pressed by one of the magnets 5.

[0049] In order to facilitate positioning, the other magnet which does not press the light touch switch can be bonded on the laser pen. In this way, the magnet plays a role of pre-positioning when the other magnet is attracted by magnetic force.

[0050] A vehicle rear axle center coordinate positioning method of the present application comprises the following steps:

[0051] S1. Vehicle rear axle center coordinate positioning devices are arranged on two opposite tires of the vehicle rear axle;

[0052] S2. The laser pen is opened by the magnet, and a laser point is generated on the ground; the laser point generated on one of the tires is marked as point A, and the laser point generated on the other tire is marked as point B; as a specific embodiment, a color pen can be used for marking or a label paper can be used for marking.

[0053] S3. The vehicle is moved away, and the distance between the two marked points is measured by a ruler. The position of the distance halved is the center position of the vehicle rear axle.

[0054] In the positioning device and the positioning method of the present application, a laser pen is externally hung on the center of each of the two rear wheels of the vehicle. The laser pen is self-provided with a bearing and will not rotate with the rotation of the tire. In this way, the light emitted by the laser pen almost vertically irradiates the ground. When the vehicle stops, the position of the light point on the ground is marked by a marking pen. When the vehicle moves away, the distance between the two points is measured by a ruler. Then, the midpoint position of the distance is the center of the vehicle rear axle. Therefore, by using the positioning device and the positioning method, the relevant parameters can be accurately and quickly measured, thereby improving the test efficiency and the test accuracy.

[0055] The positioning device of the present application can be quickly assembled on the tire of the rear wheel of the existing vehicle, and is also convenient and quick to disassemble after measurement. A specific assembly and measurement process comprises the following steps:

[0056] 1.Each tire center generally has a plastic cover, remove the cover and use a drill or other tools to punch a round hole, the size of the hole depends on the size of the rod;

[0057] 2.Make a threaded rod, the material can be aluminum, one end of the rod is internally threaded, the other end is externally threaded, the threaded rod is fixed to the plastic cover with a nut, the other end of the rod (non-nut end) is rotatably fixed with the shaft of the bearing;

[0058] 3.Use glue or a bracket to fix the laser pen to the bearing, so that the laser pen does not rotate when the wheel is moving;

[0059] 4.The switch of the laser pen is generally a touch switch, so when you want to turn on the laser pen, place a pair of magnets (with different magnetic properties according to needs) in front of and behind the laser pen switch, due to the magnetic force, press the touch switch with a certain force to turn on the laser pen;

[0060] Among them, one of the functions of the magnet is to use the magnetic interaction force to turn on the laser pen and light it up, and the second function is the weight effect, which makes the laser pen freely droop, ensuring that the laser is perpendicular to the ground, so that the laser hits the ground vertically;

[0061] 5.According to the light spot of the laser on the ground, mark a mark (such as point A) on the ground with a color pen, and similarly mark another tire laser pen mark (such as point B), after marking, move the car away, measure the distance between the two marks with a ruler, then the distance is halved to find the center position of the rear axle of the vehicle. If you don't want the color pen to dirty the ground, you can also place a label paper at the laser point position first, then make a mark on the label paper, and then tear off the label paper after measurement, so as not to affect the ground;

[0062] 6.When not testing temporarily, remove the magnet, which can save the laser pen power, so that the laser pen is quickly and conveniently turned on and off;

[0063] 7.For easy installation, the nut inside the plastic cover of the tire is preferably fixed with glue, so that when disassembling, you can quickly remove the entire set of tools by rotating the rod, and similarly, when installing the set of tools, it is also quick and convenient.

[0064] The above method can basically accurately and quickly locate the center position of the rear axle of the vehicle, which improves the efficiency of the APA development line test, shortens the development cycle, and avoids misjudgment caused by test errors.

[0065] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and they are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A vehicle rear axle center coordinate positioning device, characterized in that, include: A positioning hole, wherein the positioning hole is located at the center of the rear axle tire of the vehicle; A support rod, one end of which is fixedly connected to the positioning hole; the positioning hole is threadedly connected to the support rod. A bearing, comprising an inner ring and an outer ring, wherein a shaft is fixed to the inner ring, and the shaft is fixedly connected to the other end of a support rod; the shaft is threadedly connected to the support rod. A laser pointer, one end of which is fixed to the outer ring of the bearing; There are two magnets that attract each other and are fixed to both sides of the laser pointer by magnetic force. A tactile switch is provided on one side of the laser pointer and is pressed down by one of the magnets.

2. The vehicle rear axle center coordinate positioning device according to claim 1, characterized in that, A nut is fixed in the positioning hole, and the nut is threadedly connected to the support rod.

3. The vehicle rear axle center coordinate positioning device according to claim 1, characterized in that, The shaft has an external thread, the support rod has an internal thread, and the shaft is screwed into the internal thread of the support rod for connection.

4. The vehicle rear axle center coordinate positioning device according to claim 1, characterized in that, The laser pointer is a cuboid.

5. The vehicle rear axle center coordinate positioning device according to claim 1, characterized in that, The bearing is bonded and fixed to the laser pointer.

6. The vehicle rear axle center coordinate positioning device according to claim 1, characterized in that, The other magnet, which was not pressing down the tactile switch, was glued and fixed to the laser pointer.

7. A method for locating the center coordinates of a vehicle's rear axle, characterized in that, Includes the following steps: S1. The vehicle rear axle is provided with the rear axle of any one of the tires of claims 1-6 on both opposite tires. Axis center coordinate positioning device; S2. The laser pointer is activated by a magnet, producing laser dots on the ground; the laser dot produced on one tire is marked as point A, and the laser dot produced on the other tire is marked as point B; S3. Move the car away and use a ruler to measure the distance between the two marked points. The point where the distance is halved is the center position of the rear axle of the vehicle.

8. The method for locating the center coordinates of the rear axle of a vehicle according to claim 7, characterized in that, In step S2, mark the area with a colored pen or a label.

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